Circular optical nanoantennas: an analytical theory

Filter, Robert; Qi, Jing; Rockstuhl, Carsten; Lederer, F.

doi:10.1103/physrevb.85.125429

Cited by 63 publications

(87 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a device can be fabricated e.g. using nanosphere lithography and the single discs may be described as Fabry-Perot resonators [28,29]. A configuration with radii of 200 nm and separation of 30 nm was found to exhibit F tot ≈ 10 6...7 , and an efficiency η ≈ 0.32 at ν ≈ 26.6 THz with μ c = 1 eV.…”

Section: Efficient and Tunable Graphene Antennas For Strong Spontaneomentioning

confidence: 99%

Tunable graphene antennas for selective enhancement of THz-emission

Filter¹,

Farhat²,

Steglich³

et al. 2013

Opt. Express

108

View full text Add to dashboard Cite

Abstract:In this paper, we will introduce THz graphene antennas that strongly enhance the emission rate of quantum systems at specific frequencies. The tunability of these antennas can be used to selectively enhance individual spectral features. We will show as an example that any weak transition in the spectrum of coronene can become the dominant contribution. This selective and tunable enhancement establishes a new class of graphene-based THz devices, which will find applications in sensors, novel light sources, spectroscopy, and quantum communication devices. (Cambridge Univ Pr, 2005). 34. S. R. Langhoff, "Theoretical infrared spectra for polycyclic aromatic hydrocarbon neutrals, cations, and anions," J. Phys. Chem. 100, 2819-2841 (1996). 35. M. Steglich, C. Jäger, G. Rouillé, F. Huisken, H. Mutschke, and T. Henning, "Electronic spectroscopy of mediumsized polycyclic aromatic hydrocarbons: implications for the carriers of the 2175 Å uv bump," ApJ 712, L16 (2010). 36. P. Würfel, S. Finkbeiner, and E. Daub, "Generalized planck's radiation law for luminescence via indirect transitions," Appl. Phys. A-Mater. Sci. Process. 60, 67-70 (1995). 37. S. M. Barnett and R. Loudon, "Sum rule for modified spontaneous emission rates," Phys.

show abstract

Section: Efficient and Tunable Graphene Antennas For Strong Spontaneomentioning

confidence: 99%

Tunable graphene antennas for selective enhancement of THz-emission

Filter¹,

Farhat²,

Steglich³

et al. 2013

Opt. Express

108

View full text Add to dashboard Cite

show abstract

“…3 (b)]. This mode can be explained by a Fabry-Perot oscillation of surface plasmons that bounce between the top and bottom of the nanoring [37,38]. According to the multipole expansion [36], the new mode is an electric quadrupole (green dashed line).…”

mentioning

confidence: 99%

A generalized Kerker condition for highly directive nanoantennas

et al. 2015

View full text Add to dashboard Cite

A nanoantenna with balanced electric and magnetic dipole moments, known as the first Kerker condition, exhibits a directive radiation pattern with zero backscattering. In principle, a nanoantenna can provide even better directionality if higher order moments are properly balanced. Here, we study a generalized Kerker condition at the example of a nanoring nanontenna supporting electric dipole and electric quadrupole moments. Nanoring antennas are well suited since both multipole moments can be almost independently tuned to meet the generalized Kerker condition.

show abstract

“…In order to understand the origins of the resonances for the perfect top nano-discs layer (R = 100nm, W = 200nm), we study the electric field profiles at λ = 550nm and λ = 600nm. The analytical approaches for circular nano patch antennas have been recently demonstrated [48,49]. Following the steps reported in the previous literature, the Helmholtz equation for metal-insulator-metal geometry is solved in the cylindrical coordinates using: Fabrication of MMAs requires lithography and liftoff processes which results in slanted sidewalls of patterned surfaces.…”

Section: Resultsmentioning

confidence: 99%

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Ayas¹,

Bakan²,

Dâna³

2015

Opt. Express

View full text Add to dashboard Cite

Multispectral metamaterial absorbers based on metal-insulatormetal nano-square patch resonators are studied here. For a geometry consisting of perfectly nano-square patches and vertical sidewalls, double resonances in the visible regime are observed due to simultaneous excitation of electric and magnetic plasmon modes. Although slightly modifying the sizes of the square patches makes the resonance wavelengths simply shift, rounding corners of the square patches results in emergence of a third resonance due to excitation of the circular cavity modes. Sidewall angle of the patches are also observed to affect the absorption spectra significantly. Peak absorption values for the triple resonance structures are strongly affected as the sidewall angle varies from 90 to 50 degrees. Rounded corners and slanted sidewalls are typical imperfections for lithographically fabricated metamaterial structures. The presented results suggest that imperfections caused during fabrication of the top nanostructures must be taken into account when designing metamaterial absorbers. Furthermore, it is shown that these fabrication imperfections can be exploited for improving resonance properties and bandwidths of metamaterials for various potential applications such as solar energy harvesting, thermal emitters, surface enhanced spectroscopies and photodetection.

show abstract

Circular optical nanoantennas: an analytical theory

Cited by 63 publications

References 53 publications

Tunable graphene antennas for selective enhancement of THz-emission

Tunable graphene antennas for selective enhancement of THz-emission

A generalized Kerker condition for highly directive nanoantennas

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Contact Info

Product

Resources

About